Here are a few Dropbox alternatives:

Spideroak: Not mention of rights transference in TOS: https://spideroak.com/

Sugarsync: Very specific, reasonable rights granting in TOS: https://www.sugarsync.com/

Box.net: Very specific, reasonable rights granting in TOS: http://www.box.net/

Here are a couple self-hosted options:

Syncany: http://www.syncany.org/ /via kaerast on Twitter

Sparkleshare: http://sparkleshare.org/ kaerast on Twitter

Tonido: http://www.tonido.com/

Tahoe-lafs: http://tahoe-lafs.org/trac/tahoe-lafs

Haven't used any of them nor am I affiliated with any of them. I am likely going to be setting up a Spideroak account though.
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