diff --git a/js/components/ascribe_detail/media_container.js b/js/components/ascribe_detail/media_container.js
index 6ed69e35..2ff5a55d 100644
--- a/js/components/ascribe_detail/media_container.js
+++ b/js/components/ascribe_detail/media_container.js
@@ -62,6 +62,7 @@ let MediaContainer = React.createClass({
                     encodingStatus={this.props.content.digital_work.isEncoding} />
                 <p className="text-center">
                     <AclProxy
+                        show={['video', 'audio', 'image'].indexOf(mimetype) === -1 || this.props.content.acl.acl_download}
                         aclObject={this.props.content.acl}
                         aclName="acl_download">
                         <Button bsSize="xsmall" className="ascribe-margin-1px" href={this.props.content.digital_work.url} target="_blank">
diff --git a/js/components/ascribe_forms/form.js b/js/components/ascribe_forms/form.js
index ecbd17de..f5cfdbf7 100644
--- a/js/components/ascribe_forms/form.js
+++ b/js/components/ascribe_forms/form.js
@@ -45,7 +45,7 @@ let Form = React.createClass({
         this.setState({submitted: true});
         this.clearErrors();
         let action = (this.httpVerb && this.httpVerb()) || 'post';
-        this[action]();
+        window.setTimeout(() => this[action](), 100);
     },
     post(){
         requests
@@ -59,6 +59,7 @@ let Form = React.createClass({
         for (let ref in this.refs){
             data[this.refs[ref].props.name] = this.refs[ref].state.value;
         }
+
         if ('getFormData' in this.props){
             data = mergeOptionsWithDuplicates(data, this.props.getFormData());
         }
diff --git a/js/components/ascribe_uploader/react_s3_fine_uploader.js b/js/components/ascribe_uploader/react_s3_fine_uploader.js
index 3ececa6d..63f22d91 100644
--- a/js/components/ascribe_uploader/react_s3_fine_uploader.js
+++ b/js/components/ascribe_uploader/react_s3_fine_uploader.js
@@ -484,7 +484,6 @@ var ReactS3FineUploader = React.createClass({
         this.state.uploader.addFiles(files);
         let oldFiles = this.state.filesToUpload;
         let oldAndNewFiles = this.state.uploader.getUploads();
-
         // Add fineuploader specific information to new files
         for(let i = 0; i < oldAndNewFiles.length; i++) {
             for(let j = 0; j < files.length; j++) {
@@ -543,6 +542,7 @@ var ReactS3FineUploader = React.createClass({
         this.setState(newState);
     },
 
+
     render() {
         return (
             <div>
diff --git a/js/utils/file_utils.js b/js/utils/file_utils.js
new file mode 100644
index 00000000..4593de37
--- /dev/null
+++ b/js/utils/file_utils.js
@@ -0,0 +1,61 @@
+'use strict';
+
+import SparkMD5 from 'spark-md5';
+
+/**
+ * Takes a string, creates a text file and returns the URL
+ *
+ * @param  {string} text regular javascript string
+ * @return {string}      regular javascript string
+ */
+export function makeTextFile(text) {
+    let data = new Blob([text], {type: 'text/plain'});
+    return window.URL.createObjectURL(data);
+}
+
+/**
+ * Takes a file Object, computes the MD5 hash and returns the URL of the textfile with the hash
+ *
+ * @param  {File}   file javascript File object
+ * @return {string}      regular javascript string
+ */
+export function computeHashOfFile(file) {
+    let blobSlice = File.prototype.slice || File.prototype.mozSlice || File.prototype.webkitSlice,
+        chunkSize = 2097152,                             // Read in chunks of 2MB
+        chunks = Math.ceil(file.size / chunkSize),
+        currentChunk = 0,
+        spark = new SparkMD5.ArrayBuffer(),
+        fileReader = new FileReader();
+
+    let startTime = new Date();
+    fileReader.onload = function (e) {
+        //console.log('read chunk nr', currentChunk + 1, 'of', chunks);
+        spark.append(e.target.result);                   // Append array buffer
+        currentChunk++;
+
+        if (currentChunk < chunks) {
+            loadNext();
+        } else {
+            let fileHash = spark.end();
+            console.info('computed hash %s (took %d s)',
+                fileHash,
+                Math.round(((new Date() - startTime) / 1000) % 60));  // Compute hash
+            let hashFile = this.makeTextFile(fileHash);
+            console.info('hash: ', hashFile);
+            return hashFile;
+        }
+    }.bind(this);
+
+    fileReader.onerror = function () {
+        console.warn('oops, something went wrong.');
+    };
+    function loadNext() {
+        var start = currentChunk * chunkSize,
+            end = ((start + chunkSize) >= file.size) ? file.size : start + chunkSize;
+
+        fileReader.readAsArrayBuffer(blobSlice.call(file, start, end));
+    }
+
+    loadNext();
+
+}
\ No newline at end of file
diff --git a/package.json b/package.json
index bac4a421..44a7d3fa 100644
--- a/package.json
+++ b/package.json
@@ -83,7 +83,8 @@
     "vinyl-buffer": "^1.0.0",
     "vinyl-source-stream": "^1.1.0",
     "watchify": "^3.1.2",
-    "yargs": "^3.10.0"
+    "yargs": "^3.10.0",
+    "spark-md5": "~1.0.0"
   },
   "jest": {
     "scriptPreprocessor": "node_modules/babel-jest",