Some security problems are theoretically solvable, some are not. This one is not solvable, you can't get closer to solved as there is no "solved" state.
For example, sending a message between party A and party B so no party C can read it is possible, given that party A and party B have some way to pre-share key. Sending a message from party A to party B in a way that party B knows it is from party A but is unable to prove it to any third-party is, again, possible under some reasonable conditions, see OTR/Axolotl. Sending a message from party A to party B in a way party B can read the message but can't resend it is impossible under any conditions.
In most cases DRM-like functionality is a bullshit. Secret sharing is known to protect against outsiders only. You can use it to split backups so they are harder to steal [1]. The scheme will never work for cases when malicious party has the whole secret at some point in time.
