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ZIP password protection? Try Truecrypt. I'd feel safer with it than with that.
TrueCrypt is dead. Development was discontinued by mid-2014 and the original devs (as other security oriented people) are saying that the source is NOT secure as there are several severe code flaws, found in the second audit round. A promising successor to TrueCrypt is VeraCrypt as it fixes many vulnerabilities and security issues found in TrueCrypt. More to read here. It even got a PPA.