Data constrained resource access

A system, comprising:

• a data processing apparatus configured to:
• determine, for a user device, whether the user device is subject to a data constraint for receiving resources at the user device;
• in response to determining that the user device is currently subject to the data constraint for receiving resources at the user device:
• in response to data indicating the user device is to receive a resource, receive, at the user device, data that causes the user device to display an indication of the resource in restricted form, wherein the indication of the resource in restricted form is selectable by the user;
• in response to a selection of the indication of the resource in restricted form, provide the resource to the user device in an unrestricted form;
• wherein:
• a resource provided in an unrestricted form has a first data size;
• the data that causes the user device to display an indication of the resource in restricted form has a second data size that is less than the first data size;
• and
• in response determining that the user device is currently not subject to the data constraint for receiving resources at the user device, providing, to the user device, receiving, at the user device, the resource in the unrestricted form.

A non-transitory computer storage medium encoded with a computer program, the program comprising instructions that when executed by data processing apparatus cause the data processing apparatus to perform operations comprising:

• determining, for a user device, whether the user device is subject to a data constraint for receiving resources at the user device;
• and
• in response determining that the user device is currently subject to the data constraint for receiving resources at the user device:
• in response to data indicating the user device is to receive a resource, receiving, at the user device, data that causes the user device to display an indication of the resource in restricted form, wherein the indication of the resource in restricted form is selectable by the user;
• in response to a selection of the indication of the resource in restricted form, providing the resource to the user device in an unrestricted form;
• wherein:
• a resource provided in an unrestricted form has a first data size;
• the data that causes the user device to display an indication of the resource in restricted form has a second data size that is less than the first data size;
• and
• in response determining that the user device is currently not subject to the data constraint for receiving resources at the user device, providing, to the user device, receiving, at the user device, the resource in the unrestricted form.