This license is commonly used for video games and it allows users to download and play the game for free. There are many different open source licenses but they all must comply with the Open Source Definition - in brief: the software can be freely used, modified and shared. Programs released under this license can be used at no cost for both personal and commercial purposes. Open Source software is software with source code that anyone can inspect, modify or enhance. Freeware products can be used free of charge for both personal and professional (commercial use). Thus, unless you're storing extremely sensitive passwords, keeping a few backup files probably doesn't hurt.Freeware programs can be downloaded used free of charge and without any time limitations. However, those are likely to be theoretical in nature, and likely to affect both the case where you only have one file, and the case where you have multiple. There are many more potential cryptographic vulnerabilities that could exist (just look at the problems we saw in recent years with SSL/TLS). These can be considered secure, but the bigger question for the above is how they are used. The KeePass wikipedia page only says that AES or TwoFish can be used as cyphers. This means that an information leak exists: the attacker could see when accounts were added or removed, by looking at the difference between files (assuming the order of the passwords remains the same). For example, lets say it does not use randomized encryption. KeePass encrypts the passwords, but has some cryptographically weak way of storing the passwords. This could lead to the passwords up to that version being compromised, while deleting the older ones would have no effect. There was a vulnerability in an earlier version of KeePass, which was since patched, but that stored data in an insecure way. What could cause your approach to be less secure? Here are some hypothetical possibilities (that could become real in the future): To illustrate some cases, let us assume an attacker gets hold of all these files, rather than just one (i.e., the most recent one). There is a few reasons why it could be a problem. It's probably fine, but make sure to regularly delete really old files.
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