The Serial Private Content plugin allow to filter content in your Joomla article (or any content using the Joomla core to perform the display).
Depending the serials (or subscriptions) that the user have, the content will be displayed or hidden.

By adding a tag in your article, using the editor button or manually, you can define the blocks that you want to filter.
Configuration of the tag allow you to specify "packs" and the customer would need to have at least one serial of the mentionned packs in order to see the content.

Filtered content is replaced by a text that you can override in the tag.
You can also use a tag setting to display a link to a HikaShop product, so the customer could easily buy the product to unlock the content.

To use the plugin, you can click on the button "Private content" while using a Joomla editor.
You can also enter the tag manually.

{privatecontent pack:1 module:1 product:20 text:"This is a private content"}
The content which is only available for customers with a serial of pack with ID 1.
{/privatecontent}