如何防止许可视频/文档共享？
如果一个网站要提供视频和文档等非免费内容，那么如何提供此类内容呢？我不想编写一个偶尔连接的桌面应用程序（类似于 iTunes），这会妨碍轻松共享购买的内容，因此我对此有几个问题：
文档：什么是最佳文档格式这种情况买了之后就不能自由分享了？
如果我认为 PDF 是一种很棒的格式，因此人们无法修改其内容，并且他们实际上会看到您创建的内容，但问题是在获得它之后，它可以轻松地与其他人共享。要么有密码，要么没有。
视频：如果支持视频，最好使用一些可以处理视频流的公共（也可能是付费的）服务，例如 YouTube（据我所知，它无法拥有非公开视频） ）。
我很清楚，没有 100% 完美的解决方案可以阻止这一切，但成功锁定 90% 的内容仍然比希望人们不共享可以轻松共享的内容要好。
你能列出几个做类似事情的网站吗？我可能会从他们身上学到很多东西。请提供一些我在这方面应该遵循的准则。
是否有类似于 PDF 文档格式，具有内置安全功能？商业甚至...它应该支持某种授权功能，其工作方式与任何软件激活类似。
注意：我不确定是否应该将其发布在 webapps.stackexchange.com 上或此处，但我决定将其发布在此处，因为它与开发相关。我通常对可以使用的可编程方法感兴趣。
If a website is to provide non-free content in terms of videos and documents, how is one about to serve this kind of content? I don't want to write an occasionally connected desktop application (similar to iTunes) that prevents to easily share bought content so I have a few questions about this:
Documents: What's best document format for this kind of scenario that would prevent one to share it freely after it was bought?
If I think of PDF it's a great format so people can't temper with its content and they will actually see what you created, but the problem is that after one obtains it, it can easily get shared with others. Either having password or not.
Videos: If supporting video it's probably wise to use some public (may be payable as well) service that can handle video streaming like YouTube (which is AFAIK not able to have a non-public videos).
I'm well aware that there is no 100% perfect solution that prevents it all, but having a 90% successfully locked down content is still better than hoping people won't share something that can easily be shared.
Can you list a few websites that do a similar thing. I may learn a lot from them. And please provide some guidelines I should follow in this regard.
Is there maybe a similar to PDF document format that has built in security capabilities? Commercial even... It should support some kind of authorization functionality within that would work similarly to any software activation.
Note: I wasn't sure whether this should be posted on webapps.stackexchange.com or here but I decided it should be posted here because it's related to development. I'm generally interested in programmable approaches I could use.
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