Lee in the talk and book, and the authors of the mapping report, paint a picture of a networked, distributed, and dynamic set of activists and organizations, culminating in a day of website blackouts and millions of people contacting legislators, and street protests in the case of ACTA.
The mapping report puts the protests and online activity leading up to them in the context of debate over whether the net breeds conversations that are inane and silo’d, or substantive and boundary-crossing: data point for the latter. What does this portend for social mobilization and politics in the future? Unknown: (1) state or corporate interests could figure out how to leverage social mobilization as or more effectively than public interest actors (vague categories yes), (2) the medium itself (which now, a few generations have grown up with, if we allow for “growing up” to extend beyond high school) being perceived at risk may have made these protests uniquely well positioned to mobilize via the medium, or (3) this kind of social mobilization could tilt power in a significant and long-term way.
Lots of people seem to be invested in a version of (3). They may be right, but the immediate outcome makes me sad: the perceived cutting edge of activism amounts to repeated communications optimization, i.e., spam science. Must be the civil society version of “The best minds of my generation are thinking about how to make people click ads. That sucks.” This seems eminently gameable toward (1), in addition to being ugly. We may be lucky if (2) is most true.
On the future of “internet freedoms” and social mobilization, Lee doesn’t really speculate. In the talk Q&A, lack of mass protest concerning mass surveillance is noted. The book’s closing words:
“We tried not to celebrate too much because it was just a battle. We won a battle, not the war. We’re still fighting other free trade agreements and intellectual property enforcement that affect individual rights.”
In a way, the fight for digital rights had only just begun.
Of course my standard complaint about this fight, which is decades old at least, is that it does not consist merely of a series of rearguard battles, but also altering the ecosystem.
Speaking of public benefit spaces on the internet, tonight the Internet Archive is having its annual celebration and announcements event. It’s a top contender for the long-term most important site on the internet. The argument for it might begin with it having many copies at many points in time of many sites, mostly accessible to the public (Google, the NSA and others must have vast dark archives), but would not end there.
I think the Internet Archive is awesome. Brewster Kahle, its founder, is too. It is clear to me that he’s the most daring and innovative founder or leader in the bay area/non-profit/open/internet field and adjacencies. And he calls himself Digital Librarian. Hear, hear!
But, the Internet Archive could be even more awesome. Here’s what I humbly wish they would announce tonight:
A project to release all of the code that runs their websites and all other processes, under free/open source software licenses, and do their work in public repositories, issue trackers, etc. Such crucial infrastructure ought be open to public audit, and welcoming to public contribution. Obviously much of the code is ancient, crufty, and likely has security issues. No reason for embarrassment or obscurity. The code supporting the recording of this era of human communication is itself a dark archive. Danger! Fix it.
WikiNurture media collections. I believe media item metadata is now unversioned. It should be versioned. And the public should be able to enhance and correct metadata. Currently media in the Internet Archive is much less useful than it could be due to poor metadata (eg I expect music I download from the archive to not have good artist/album/title tags, making it a huge pain to integrate into my listenng habits, including to tell the world and make popular) and very limited relations among media items.
Aggressively support new free media formats, specifically Opus and WebM right now. This is an important issue for the free and open issue, and requires collective action. Internet Archive is in a key position, and should be exploit is strong position.
On top of existing infrastructure and much richer data, above, build Netflix-level experiences around the highest quality media in the archive, and perhaps all media with high quality metadata. This could be left to third parties, but centralization is powerful.
Finally, and perhaps the deadly combination of most contentious and least exciting: stop paying DRM vendors and publishers. Old posts on this: 1, 2, 3. Internet Archive is not in the position Mozilla apparently think they are, of tolerating DRM out of fear of losing relevance. Physical libraries may think they are in such a position, but only to the extent they think of themselves as book vendors, and lack vision. Please, show leadership to the digital libraries we want in the future, not grotesque compromises, Digital Librarian!
Addendum 20131110: “What happened to the Library of Alexandria?” as a lead in to explaining why the Internet Archive has multiple data centers will take on new meaning from a few days ago, when there was a fire at its scanning center (no digital records were lost). Donate.
As expected (see my pre-event post) the setting was great: nice space, thoughtful, well-executed and highly appropriate installation. I enjoyed the conversation; perhaps you will too.
With more time it would’ve been great to talk about some of Syjuco’s other works, many of which deal more or less directly with copying (see also interviews with Syjuco). I don’t think either of us even used the word appropriation. Nor the term “open source”, despite being in the installation title — for example, why is intersection of formal Open Source (and similar legally/voluntarily constructed commons) and art, appropriation or otherwise, vanishingly small?
A Penny for Your Thoughts by Talllama is the winner, unanimously selected by the jury. It’s a fun transposition of exactly today’s copyright and debates (including wild mischaracterization) into a future with mind uploading. Quotes:
“My mom and dad would get upset at me.” He sent her a copy of his anxiety.
“Well my dad says copyright is stupid,” Helen said, sending back an emotion that was pitying yet vaguely contemptuous. “He says anyone who won’t pirate is a dummy.”
Timothy scowled at her. “My dad says that piracy is stealing.”
“My dad and I have trillions of books and thoughts, so we know better than you,” Helen said.
“You see, Timothy,” his father continued, “If people didn’t have an incentive to think or dream, they wouldn’t. And then no one would have any new thoughts. Everyone would stop thinking because there wouldn’t be any money in it.”
“But you said people had thoughts in 1920 even though there was no copyright.”
“Yes, you’re right. What I mean is that there were no professional thinkers in those days.”
“It would be bad if people stopped thinking,” Timothy said.
Lucy’s Irrevocable, Colossal, Terrible Mistake by Chris Sakkas tells a story in which releasing stuff under a free license has amazing results. Unfortunately free licenses aren’t magic, and it isn’t clear to me what the story says about the future of copyright. Quote:
An alternative bookshop in Sussex, on the other side of the world to Lucy, created a video ad with her favourite song as its backing track. The ad ended with a thanks to Lucy for releasing her music under a free, libre and open licence and a hyperlink. Hundreds more people visited her site, the passive consumers of big business! They used the donate button on her site to spray her with filthy lucre.
Perfect Memory by Jacinto Dávila describes a world of 2089 mediated by perfect memory of all non-intimate events and voting for assignment of credit; copyright plays what role in such future? Quote:
[Socio-mathematics] was also the source of an unprecedented and fundamental agreement. All the stakeholders of the world came, after many unfortunate and even bloody events, to negotiate a new framework for producing and sharing common knowledge. And the basis they found was that to preserve freedom, but also the health of the whole planet and its species, that knowledge had to be shared, easily and readily, among all the stakeholders.
That led to a rebuttal of so-called intellectual property and copyright laws and their replacement with a body of global law acknowledging our common heritage, codependent future and the fundamental right of knowledge everyone has.
Copyrights in Chopin’s future by Krzysztof Blachnicki (English translation by Wojciech Pędzich) has Chopin resurrected in 2015 through unspecified but expensive means, then exploited by and escaping from the current recording industry. A fun idea, but ultimately a stereotypical anti-recording-industry rant. Quote:
I hope that more people will have their own opinions instead of listening to the hissing of those snakes, sucking money out of artists to pay off their new automobiles. Wake up, folks, a good musician will earn his daily bread even if he decides to let his music go for free, for all to share. A poor man will be able to listen to real music, while a wealthy man will make the artist’s effort worthwhile. Isn’t it all about just that? Each may benefit, except the music companies which become redundant, so they turn to lies in order to keep themselves afloat.
What is an author? by refined quotes is a story in which all legal ideas are closely regulated and bland, “old art” outlawed so people consume new, legal stuff, the good stuff and real artists are underground, and with an additional twist that ideas take animal form. Quote:
You see? An artist is a little like an art producer. But he deals with the genuine ideas, as you see. He doesn’t buy them, like the law says he should. He just comes to places like this and spends his time with them. It’s a slow process. No one knows why precisely, but this crazy little ideas are in love with him, well, with all the artists.
The Ambiguous Future of Copyright by HOT TOCO is a snarky take on where copyright and computing are headed, presumably meaning to project ambiguous reception of Ubuntu/Canonical ten years into the future. Quote:
Friend2: “If I can extract info from this rant, I think Commonible, Ltd, is saying they’ve perfected trusted computing, fully protecting you from hacking and making ALL media available, fully compensating all value chains.”
Friend3 (quiet one): “I read about sth like this, Project Xanaxu. Real old stuff. The inventor thought the Web failed to transclude micropayments.”
500 Years of Copyright Law by Holovision embeds current copyright factoids in description of future eras. I can’t tell what its “Copynorm Exchange Decentralization Entente (CEDE)” regime consists of, but maybe that is also a current copyright factoid: someone reading a pamphlet describing copyright and mentioning a few acronyms (eg TRIPs) would not have much sense of the regime. Quote:
Attempts to put digital rights management into 3D printers were sooner or later unsuccessful against hardware hackers. There were open sourced 3D printers but many perceived them to be inferior to the commercially patented ones. When the commercial 3D printers were used to make other printers most companies left the marketplace. This left many still infringing the 3D printers with the excuse that the printers became “abandonware”.
Copyright Protest Song by Tom Konecki doesn’t seem to say anything about the future, but does capture various bits of complaint about the current regime. Quote:
Everybody wants only money and success
And none remembers the idea of open-access
To acquire knowledge and gather information
That is now the object of companies’ manipulation.
Copyright – Real Vision or fantastic vision? by Arkadiusz Janusz (English translation by Kuba Kwiatkowski) contains a proposal of the type “metadata and tracking will get everyone paid” explained in a parent-child lecture. Quote:
The file doesn’t contain a price, only points. In other words, the price is quoted in points. A point has a different monetary value for every country. Here, the minimum wage is about 1000 dollars. We divide the minimum wage by one thousand and receive the amount value of 1 point. If you download a movie, the server checks in which country you are, and converts the points into the appropriate price.
That’s why in our times, pirates are at on the verge of extinction. Most frequently, they’re maniacs or followers of some strange ideologies.
You can also read my review of last year’s future of copyright contest anthology, which links to each selection. This year’s selections are notably less dystopian and take less of a position on what the future of copyright ought be.
I enjoyed judging this year’s contest, and hope it and any future iterations achieve much greater visibility. Current copyright debates seem to me to have an incredibly short-term focus, which can’t be for the good when changes which have supposedly produced the current debate are only speeding up. Additionally, and my one complaint about the contest other than lack of fame, is that “copyright” is a deeply suboptimal frame for thinking about its, and our, future. I will try to address this point directly soon, but some of it can be read from my contest entry of last year (other forms of info regulation with different policy goals being much more pertinent than quibbling over the appropriateness of the word “copyright”).
Last year I was impressed with Modern Poland Foundation’s crowdfunded (the prize set by donations) Future of Copyright contest — my entry and review of the winners/contest anthology. I’m honored to be on the jury for this year’s contest. Please donate (deadline July 7) to support the prize, enter your text or audiovisual work (less than 15,000 characters or 10 minutes; deadline July>August 1), and spread the word.
I really encourage reading last year’s anthology (each entry linked from my review, or all as a pdf) and note how broadly and provocatively “future of copyright” might be construed. Also, all entries are BY-SA licensed; some may be useful as remix material.
Addendum 20130706: The deadline for entering a work in the contest has been moved to August 1. The deadline for donating to support the prize is still the end of July 7, pacific time: 35 hours from the time I write this. Rules and donation info both on the same page, http://www.indiegogo.com/projects/future-of-copyright-contest-2-0
The nominal goal of US$500 has been met, but more support is welcome. If you’re into patron rewards, the $50 level is probably worthwhile — good for a printed book of the top entries. Last year I donated at a similar level and was surprised to receive a thin large format volume in hard binding, scanned above. (But I have no idea what the organizers have planned this year.)
I’ll post a review in the fullness of time, but for now I recommend reading the 73 essays in the book (mine is not the essay I’d contribute today, but think it useful anyway) not primarily as critiques of market, state, their combination, or economics — it’s very difficult to say anything new concerning these dominant institutions. Instead read the essays as meditations, explorations, and provocations for expanding the spaces in human society — across a huge range of activity — which are ruled not via exclusivity (of property or state control) but are nonetheless governed to the extent needed to prevent depredation.
The benefits of moving to commons regimes might be characterized any number of ways, e.g., reducing transaction costs, decreasing alienation and rent seeking, increasing autonomy and solidarity. Although a nobel prize in economics has been awarded for research on certain kinds of commons, my feeling is that the class is severely under-characterized and under-valued by social scientists, and thus by almost everyone else. At the extreme we might consider all of civilization and nature as commons upon which our seemingly dominant institutions are merely froth.
Another thing to keep in mind when reading the book’s diverse essays is that the commons “paradigm” is pluralistic. I wonder the extent to which reform of any institution, dominant or otherwise, away from capture and enclosure, toward the benefit and participation of all its constituents, might be characterized as commoning?
Whatever the scope of commoning, we don’t know how to do it very well. How to provision and govern resources, even knowledge, without exclusivity and control, can boggle the mind. I suspect there is tremendous room to increase the freedom and equality of all humans through learning-by-doing (and researching) more activities in a commons-orientated way. One might say our lack of knowledge about the commons is a tragedy.
Later this month the Economics and the Commons Conference, organized by Wealth of the Commons editors David Bollier and Silke Helfrich, with Michel Bauwens, will bring together 240 researchers, practitioners, and advocates deeply enmeshed in various commons efforts. There will be overlapping streams on nature, work, money, infrastructure, and the one I’m coordinator for, knowledge.
I agreed to coordinate the stream because I found exchanges with Bollier and Helfrich stimulating (concerning my book essay, a panel on the problematic relationship of Creative Commons and commons, and subsequently), and because I’m eager to consider knowledge commoning (e.g., free software, culture, open access, copyright reform) outside of their usual venues and endlessly repeated debates, and because I feel that knowledge commons movements have failed dismally to communicate their pertinence to each other and with the rest of the world — thus I welcome the challenge and test case to communicate the pertinence of all knowledge commons movements to other self-described commoners — and finally, to learn from them.
Here are the key themes I hope we can explore in the stream:
All commons as knowledge commons, e.g., the shared knowledge necessary to do anything in a commons-oriented way, easily forgotten once exclusivity and control take hold.
Knowledge enclosure and commoning throughout history, pre-dating copyright and patent, let alone computers.
How to think about and collaborate with contemporary knowledge commoners outside of the contractually constructed and legal reform paradigms, eg transparency and filesharing activists.
How can we characterize the value of knowledge commons in ways that can be critiqued and thus are possibly convincing? What would a knowledge commons research agenda look like?
If we accept moving the provisioning of almost all knowledge to the commons as an achievable and necessary goal, what strategies and controversies of existing knowledge commons movements (tuned to react against burgeoning enclosure and make incremental progress, while mostly accepting the dominant “intellectual property” discourse) might be reconsidered?
This may appear vastly too much material to cover in approximately 5 hours of dedicated stream sessions, but the methodology consists of brief interventions and debates, not long presentations, and the goal is provocation of new, more commons-oriented, and more cross-cutting strategies and collaborations among knowledge commoners and others, not firm conclusions.
I aim for plenty of stream documentation and followup, but to start the public conversation (the conference has not been publicized thus far due to a hard limit on attendees; now those are settled) by asking each of the “knowledge commoner” participants to recommend a resource (article, blog post, presentation, book, website…) that will inform the conversation on one or more of the themes above. Suggestions are welcome from everyone, attending or not; leave a comment or add to the wiki. Critiques of any of the above also wanted!
For background on my part of the conversation, perhaps read my bit on the future of copyright and my interview with Lewis Hyde, author of at least one of the treated FREE TEXTS (in the title of this post “beating of books” is a play on “beating of bounds”; see the interview, one of my favorite posts ever to the Creative Commons blog).
One of the things that makes FREE TEXTS just right is that “IP” makes for a cornucopia of irony (Irony Ponies for all?), and one of the specialty fruits therein is literature extolling the commons and free expression and problematizing copyright … subject to unmitigated copyright and expensive in time and/or money to access, let alone modify.
Even when a text is in-theory offered under a public license, thus mitigating copyright (but note, it is rare for any such mitigation to be offered), access to a digital copy is often frustrated, and access to a conveniently modified copy, almost unknown. The probability of these problems occurring reaches near certainty if a remotely traditional publisher is involved.
Two recent examples that I’m second-hand familiar with (I made small contributions). All chapters of Wealth of the Commons (Levellers Press, 2012) with the exception of one are released under the CC-BY-SA license. But only a paper version of the book is now available. I understand that digital copies (presumably for sale and gratis) will be available sometime next year. Some chapters are now available as HTML pages, including mine. The German version of the book (Transcript, 2012), published earlier this year with a slightly different selection of essays, is all CC-BY-SA and available in whole as a PDF, and some chapters as HTML pages, again including mine (but if one were to nitpick, the accompanying photo under CC-BY-NC-SA is incongruous).
In the long run, these can be just annoyances and make-work, at least to the extent the books consist of material under free licenses. Free-as-in-freedom does not have to mean free-as-in-price. Even without any copyright mitigation, it’s common for digital books to be made available in various places, as FREE TEXTS highlights. Under free licenses, it becomes feasible for people to openly collaborate to make improved, modifiable, annotatable versions available in various formats. This is currently done for select books at Wikibooks (educational, neutral point of view, not original research) and Wikisource (historically significant). I don’t know of a community for this sort of work on other classes of books, but I’d be happy to hear of such, and may eventually have to start doing it if not. Obvious candidate platforms include Mediawiki, Booktype, and source-repository-per-book.
You can register for the event (gratis) in order to help determine seating and refreshments. I expect the conversation to be considerably more wide ranging than the above might imply!
Someday I will read Exit, Voice, and Loyalty (1970) and comment on pertinence to things I write about here (cf my almost due for 8 year refutation notes onThe Logic of Collective Action (1965)), but I have long found the concept intuitive.
The Declaration of Twitter Independence has been quicklyridiculed. In addition to its over the top language, one way to think about why is that it seems an almost certainly futile and maybe inappropriate (Twitter won’t listen, and perhaps shouldn’t; Twitter can do whatever they want with their services) attempt at voice, accompanied with a halfhearted at best exit plan (“explore alternate platforms, giving precedence to those who do support such [muddled] principles [until Twitter adopts a more developer friendly policy]“).
“Doing it right” per the crowd I’m most familiar with (including me) is almost all exit: start developing your apps for StatusNet/OStatus and other federated and open source social web software/protocols; any voice should demand support for federation, ie facilitate exit. Twitter apologists would say Twitter is doing the right thing for the Twitter ecosystem, the complainers should deal. Twitter loyal oppositionists would say Twitter is doing its greatness a disservice with its policies and should change. I’m not sure what people who care but are in neither the federated nor Twitter apologist/loyalist camps might think, but I’d like to know.
The Declaration doesn’t lend itself to a charitable reading, I think it is worth giving it one. Regarding its futile and perhaps inappropriate attempt at voice: it is OK for customers to complain; smart companies often even listen and adjust; Twitter is now a large organization, parts of it very smart; worth a try. Regarding exit, they don’t want to, and there isn’t anyplace completely obvious for them to go, much as I’d like that to be StatusNet/OStatus; “explore alternate platforms” and wanting no limits on how data can be used and shared, and data available in standard formats all support exit, with the right amount of tentativeness. Although that charitable reading is possible, the Declaration could’ve been written much more strongly regarding all of the points discussed above. Low probability that I’ll fork it to do so.
Collaborative Futures mentions exit, voice, and loyalty in the context of free collaboration projects. It appears from the history that I didn’t write that bit, though it covers a pet concept and uses a pet phrase (configurations). That chapter is way too short, but I’m pleased in retrospect with its nuance, or rather, with the charitable readings I’m able to give it.
When I eventually return to this topic, I will probably complain that software freedom and nearby advocates are overly focused on exit, with lots of untapped potential for the movements in voice and loyalty, possibly the same for political libertarians, and that it difficult to keep in mind more than two of exit, voice, and loyalty, and the frequency of their pairings.
Last week Wikimania included a reception in an impressive hall at the Library of Congress. But far more impressive than the hall was the Gutenberg Bible on display, apparently one of a few complete vellum copies, and one of a few dozen known copies of any sort. I don’t recall ever feeling stunned to be in the presence of an artifact before.
After standing before the display case speechless for a bit, I read some explanatory text nearby:
Gutenberg’s invention of the mechanical printing press made it possible for the accumulated knowledge of the human race to become the common property of every person who knew how to read—an immense forward step in the emancipation of the human mind.
I can’t find a source for that text, but it has been on display for at least four years. It was incredibly apt for Wikimania, as it reads very much like the Wikimedia Foundation’s vision:
Imagine a world in which every single human being can freely share in the sum of all knowledge.
Wikimania provided plenty of evidence both for how rapidly Wikimedia projects are progressing (in particular technology projects that seemed fantasies a few years ago, such as Wikidata and a visual editor, will be deployed over the next year) but also how far away humanity is from the potentials expressed above — particularly driven by bad policy, which in turn impoverishes practice — resulting in Wikipedia being unique, when instead all knowledge of all forms could be subject to mass curation and sharing.
In case I do not blog further about Wikimania: I enjoyed helping Asheesh Laroia with the pre-conference hackathon, Mayo Fuster Morell with a BoF-style meetup on digital commons, and tons of great conversations. Thanks to the organizers, all attendees, and all Wikimedians for such a great conference and movement!
Perhaps someday I will stand in the presence of the Dunhuang Diamond Sutra, the oldest printed book with a date (868CE), held in the British Library. I don’t know whether it would stun me, but I have noted a statement in its colophon:
Reverently [caused to be] made for universal free distribution by Wang Jie on behalf of his two parents on the 13th of the 4th moon of the 9th year of Xiantong.
I read all of the pieces selected for a „Future of copyright” anthology resulting from a contest run by the Modern Poland Foundation (apparently the winner of a small cash prize will be announced tomorrow; I highly recommend all of the pieces below and commend the judges for their selections):
7 are fiction (the 3 exceptions are me, Spitzlinger, and Togi). 5 of these are dystopian (exceptions: Binns, Mansoux), 4 of which (exception: Żyła) involve some kind of fundamental loss of personal control as a result of intellectual protectionism (even more fundamental than drug war style enforcement involves, which Żyła’s does concern). 3 of these (exception: Eddie) involve extrapolations of DRM, 2 of which (exception: Melin) involve DRM implants.
I’d like to see versions of the dystopian stories written as IP propaganda, e.g., recast as RIAA/MPAA pieces from the future (several of the stories have funnily named future enforcement organizations in that vein). Such could be written as satire, apology, or even IP totalist advocacy (utopian rather than dystopian).
Of the dystopian stories, Solís is probably most dystopian, Eddie most humorous, and Betteridge overall best executed. Żyła needs a bit of development — the trend posited is incongruous and unexplained — but maybe due to an unknown factor to be suggested by fictional future freakonomics, or perhaps I just missed it. Melin ends with some hope, but annoys me for contemporary reasons — why would the recipient of a body part artificially grown with “open” methods be constrained in the disposition of that part by a “Creative Commons license” on those methods? Another reason to discourage use of CC licenses for hardware design.
The two non-dystopian stories take the form of a “letter from the future” in which various “open” movements and “models” win (Binns; if I had to bet on a winner of the contest, I’d put my money on this one) and an allegory for the history and projected future of copyright (Mansoux; probably the piece I enjoyed reading most).
Of the 3 non-fiction pieces, Togi is most non-standard — a rant in the form of lemmas — and fun, though briefly goes off the rails in asserting that “those entities which represent the greatest tax gain will be preferred by government.” If that were the case, all that is prohibited would instead be taxed. Statements about “revenue” leave little wiggle room, but I suppose a charitable interpretation would include in “tax gain” all rents to those influencing power, be they bootleggers, baptists, or those directly obtaining tax revenue. Spitzlinger accepts the stories my piece rejects and suggests something like the Creative Commons Attribution-NonCommercial-ShareAlike license be the default for new works, with the possibility of additional temporary restriction (a one-year usufruct, perhaps?).
All of the pieces evince unhappiness with the current direction of information governance. Of those that reveal anything about where they stand on the reform spectrum (admitting that one dimension makes for an impoverished description of reform possibilities; that’s one of the points I hoped to communicate in my piece) I’d place Binns, Melin, and Spitzlinger away from abolition, and me, Mansoux, and Togi toward abolition.
I expect the contest and anthology to be criticized for only representing reform viewpoints. Sadly, no maximalist pieces were submitted. The most moderate reform submission didn’t follow contest rules (not a new piece, no license offered). More than alternate perspective versions of IP dystopias, I’d like to see attempts to imagine future systems which increase private returns to innovation, perhaps looking nothing like today’s copyright, patent, etc., and increase overall social welfare — I’m dubious, but please try.
Update 20120524: The two most fun and non-standard entries won — Mansoux, with an honorable mention to Togi. I now must also congratulate the judges on their good taste. Read those two, or the whole anthology (pdf).