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Systems, methods, routines and/or techniques are described to protect users from undesirable content, for example, on an open platform. One or more embodiments may prevent the installation of an application package or warn a user if the application package may be undesirable (eg, because it may contain malware). In one or more embodiments, a method may include receiving a first request to install an application package, and receiving and/or capturing metadata related to the application package. The method may include communi cating a second request (eg, including the metadata) to a remote server, such that the remote server can determine whether the application package may be undesirable. The method may include receiving a response from the remote server, where the response may indicate whether the applica tion package may be undesirable, and initiating installation of the application package …