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I am interested in forward locking a downloaded file (an image, or a video, etc.). Is there any way to do this?
As far as I can tell packages can be forward locked, but their resources remain public. Is there a way to forward lock a specific file I’ve downloaded to the Android?
This depends.
In order to do that, you need to use a DRM forward lock.
http://en.wikipedia.org/wiki/OMA_DRM
http://answers.yahoo.com/question/index?qid=20091231141343AAx7cVS
But doing so isn’t quite simple.
Also, if you are an app developer you can download files to a private folder. This should be reasonably safe but I think that people with rooted devices could see the files if they wanted to. Also, be sure to use a secure connection (https) otherwise people could intercept the traffic and reconstruct the file! DRM already addresses this issue.