Authentication of content download

A computing device for authenticating download of a digital content file ordered by a client from a web site, the computing device comprising:

• one or more hardware processors configured to:
• send an indication of selection of the digital content file toward the web site via a network;
• receive the digital content file via the network;
• receive a first code via the network, the first code indicative of at least a portion of the digital content file, wherein if the portion of the digital content file is changed, the first code changes, and further wherein the first code is unique to the client;
• calculate a second code with the portion of the digital content file a repeated number of times;
• check if the second code corresponds to the first code after each calculation;
• receive at least the portion of the digital content file again if the check fails;
• and
• when a new version of the digital content file is available:
• receive a new first code indicative of the new version of the portion of the digital content file, wherein:
• if the new version of the portion of the digital content file is changed, the new first code changes, and
• the new first code is unique to the client,
• calculate the second code with the portion of the digital content file during one of the repeated calculations of the second code,
• check if the second code that was calculated during one of the repeated calculations corresponds to the new first code, and
• upon the second code that was calculated during one of the repeated calculations not matching the new first code, receiving the new version of at least the portion of the digital content file.

A method for authenticating download of a digital content file ordered from a web site, the method comprising steps of:

• receiving a selection of the digital content file with the web site from a client;
• calculating a first code indicative of at least a portion of the digital content file, wherein if the portion of the digital content file is changed, the first code changes, and further wherein the first code is unique to the client;
• sending the digital content file to a client computer;
• sending the first code to the client computer, wherein the client computer is configured to calculate a second code indicative of the portion of the digital content file a repeated number of times after download;
• sending a media identifier to the client computer, wherein:
• the media identifier comprises a unique code, and
• the unique code correlating the digital content file to license information and correlating the digital content file to the client;
• storing the media identifier in a remote database cross-referenced to each of:
• the digital content file,
• the client, and
• the license information;
• and
• re-sending the digital content file if the client computer determines the first code doesn't match the second code.

A method for authenticating download of a digital content file ordered from a web site, the method comprising steps of:

• receiving a selection of the digital content file with the web site from a client;
• calculating a first code indicative of at least a portion of the digital content file, wherein if the portion of the digital content file is changed, the first code changes, and further wherein the first code is unique to the client;
• sending the digital content file to a client computer;
• sending the first code to the client computer, wherein the client computer is configured to calculate a second code indicative of the portion of the digital content file a repeated number of times after download;
• re-sending the digital content file if the client computer determines the first code doesn't match the second code;
• and
• when a new version of the digital content file is available:
• calculating a new first code indicative of the new version of the portion of the digital content file, wherein:
• if the new version of the portion of the digital content file is changed, the new first code changes, and
• the new first code is unique to the client,
• sending the new first code to the client computer, and
• sending the new version of the digital content file to the client computer when the client computer determines, during one of the repeated calculations of the second code, that the new first code doesn't match the second code.

A method for authenticating download of a digital content file ordered from a web site, the method comprising steps of:

• receiving a selection of the digital content file with the web site from a client;
• calculating a first code indicative of at least a portion of the digital content file, wherein if the portion of the digital content file is changed, the first code changes, and further wherein the first code is unique to the client;
• sending the digital content file to a client computer;
• sending the first code to the client computer, wherein the client computer is configured to calculate a second code indicative of the portion of the digital content file a repeated number of times after download;
• re-sending the digital content file if the client computer determines the first code doesn't match the second code;
• and
• when a license for the digital content file expires, performing the steps of:
• replacing the first code with a different first code, wherein the different first code is different than the first code,
• sending the different first code to the client computer, and
• not sending the digital content file when the client computer determines, during one of the repeated calculations of the second code, that the different first code doesn't match the second code.