I would like to request feature to securely limit access to private files.

1) By time limit - after which it isn't possible to access to file
 - On request file can have generated secret key and file identifier which could be used in secure uri generation

 and generate secure uri like this:
	file:			my_secret_data.rar
	file identifier:	123456789
	file secret key:	BlahBlahBlah
	valid time:		3600 [in secounds]
	expire time:		current time [in seconds from 1970.01.01 03:00:00 GMT] + <valid time> 

 http[s]://content[??].wuala.com/ [something] /<md5 or sha1 or sha256>( <file identifier> + ";" + <file secret key> + ";" + <expire time> ) + "-t" + <expire time> + "/" + <file>

2) By user IP/IP region - from others aren't possible to access to file
 - generate secure uri similar to 1 example

3) By amount of times file can be downloaded (must have some random identifier added so that i can generate 3 different secure uris so that for each uri downloads are being counted seperately)

 and generate secure uri like this:
	file:			my_secret_data.rar
	file identifier:	123456789
	file secret key:	BlahBlahBlah
	allowed download count:	5
	random key for download conting: BlahBlahBlah2 [something random]

 http[s]://content[??].wuala.com/ [something] /<md5 or sha1 or sha256>( <file identifier> + ";" + <file secret key> + ";" + <random key for download conting> + ";" + <allowed download count> ) + "-lk" + <random key for download conting> + "-lt" + <allowed download count> + "/" + <file>

4) By user name (only one specific user can download file from specified secure uri)

5) Variations from previous variants

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Sorry for my bad grammar and spelling, i havent slept for few days, and also i am not a people person, because i am only coder

If you need help for developing specification in depth you can contact me - 4e4en